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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbee025f424a2939cd2a95f8d653bef49192485d8a0e657bf4b86b03f4847472' 
  AND token = 'uNFUokntJvyO0uYH7nhl4j4fJ1kcTpjfRCLhSPJed2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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