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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d86a54bac9d7734c2ef433eb65453449c162396c7b295ba6910c64ad5dd621e' 
  AND token = 'L3Lnvru4j0j4z7aHXce7/dNP4QcFUl7IZhfI1GlGrT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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