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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14e21923fb463485e6cd47efcaf2cacc24c259bce9030875debc23d3cfb76b8' 
  AND token = 'KLttaOauBbfR3+x13hGDLTWEr24p/X4GTMp9j6tLwqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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