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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bb96e169820c256691a9b4ec01a676a0c76c662eccfc3e087178429fa2c512' 
  AND token = '7tytVemxaRQeCGwHXhfoxWbQI2b++BZT1yzWQhSX05A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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