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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7702827d21407b0fd9ad1d4c36908c2f3870b51556a963d5a3ee3e5c39f4d7c9' 
  AND token = 'A4I8snOTjxl9X2L79Heq/pTdi/lDKRHgYb8YTA0LdEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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