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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7974d47ee9734e1d5e80423a1d465f1ea089d1fecb0924338bbbc63594d14b48' 
  AND token = 'nL3+x7aYYiJMrWJTwtrH9EJZLw/diot9+O3zopE6wzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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