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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87459f431ca8126f41b6e7a9c807ca2e5dab6c6e610006ae6251161850ae570a' 
  AND token = '4V1/Im/PrrkrWlb8GEXQghzokIFHaLQXwQTfV6CecYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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