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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568a60f85dc408369c5c40a854d7acba18f43a0126aede606ac64b4bddd4d19d' 
  AND token = 'J7OPs6FpWdgwh+1Yu8kmc7nQ3YceV8OWE4T0nAVGz/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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