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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18e1db3bec9e2f3533c037975025102fdeb3cde19d37226b9466fa4d7b5eb4f' 
  AND token = 'i7LmuCXfbhfW7ZKlZU1qtLrRFtYFRl+yVs2D9amLWSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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