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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73934b1e97f928096e403460a60b43bc1f85381adbc0b8650db06c4ae486363b' 
  AND token = 'CUt2OJ+kA/18ahhW8giT65YpeXj+1zXkaPfFPjje5M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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