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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ec1c96acdcacf9037bdad47e20aff9a5cbcbef901e446c5e92de050fff0515' 
  AND token = 'oM3+30Q4RZRQk9eb98hVaUUjmypytqhqwRK7d5N/LM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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