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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3870a26a0e85eb54047aec37c65488ccf10490d0f2a6f55431bfa1be41a81d4a' 
  AND token = '/ISs60SF9VBhR/YItycVjt46Tsx+TqtYCHt88rBqINg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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