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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ee514173393abccd6b9e525cae204e51ae2a1bbdfcdf97b40e686a98e54a51' 
  AND token = 'oBPj7f0kk2yiygPEZEi6BbrdYzTtw1P2v8jtWECw7kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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