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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7284bbfd5b53bad7cf8ea2c7db9e88961c57f9c6fccba9a228d39e3756fdbccc' 
  AND token = 'EgKua24CpnwPyGFX0LAlm3aYsDM+ouEMhSbxoO312oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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