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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ce4c7d22b3b63920bc2350a72b79c6f702039bf831bed1840b27f21c689da5' 
  AND token = '2rw/CV2YrtwUsleup9Ez4+N8nO5a0UGzii+dH64qyMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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