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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03c0879a9e60ab97b1ce53c55f0ef7efff75ba529ab50e2dd5ec2be53bdea84' 
  AND token = 'Ixd3tg5490KSiXbxNFw0C94BPx+70uhv5jV95pdb7vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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