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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c9bc63cc9c772bd6a61099cc60aab0e1a99f6d1e7a04b11afd5dd562814af1' 
  AND token = 'PouEy9tdcpx/j7hp87ExZh1D2fBQCq4jRqowW3A8sR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}