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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b4aea5f31cb58f9f288d7f9d64bbe28d723358ab5450f46d0c1c070704f58d' 
  AND token = 'z03p+g8cn8ebycCYx+rGiSmIREHE6R8IF3fZg19woYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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