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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d77af195613e0d45b67fc7fc306c58d6631fa7b17be985c7e59f67ded315284' 
  AND token = 'F83totQzQHfs52jyu6T2ozQstU/KAgNjfFwEFJ3auZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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