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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9afa6df8228b51cb431ef94af85c0e56093b5cdd40f2c06458ed58052ca132' 
  AND token = 'LPTWVmvG680QdMgywlzKHPIVg613sRIATTOye+KYIk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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