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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff150a62bf07cb49d1f4f9a7971f21eabf811af9138a71d9dad39615318fb3d6' 
  AND token = 'SzxsVwkhMWmuRyjOtsDq0E919iANPpNcnbhpAiw4yLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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