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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f355c991600aab7977e5c9b9b9bc3bb8888f8de5c2032c547c00960f13e4477' 
  AND token = '4lLAxKW6C0mEuo5wPFdV5m7A0F1nxrUtkuqE4BcR8W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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