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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eba3fb8a9113664954bca307a530ee723b7130a132cf801852ca9682ac3187b' 
  AND token = 'QGyhLQN+2tdaXDM6N0BjwsghD5/izSjHTrgR3XfFB1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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