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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fbf7a9dc4f1b4a856a46ccd182f00229fa78211a738d61ffc0d2b209e0e0bd' 
  AND token = 'nAJLdXy2b5jung7h0nDxxw+1uERy65gkNu1+zkLIKCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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