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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e2e8c099274c80d336acb3f715b3efa021b560835b4990565c4b9a0f7b44a9' 
  AND token = 'Xqck4kA9xKazySK0ITx8xJhaKo3+AjzrYETzXGv3IGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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