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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e6bfd5fe384a00f16741cc48f3205402d246a793c9d42505f03d87f5a6be94' 
  AND token = 'q2pieNEIGjMxrXxRcwnmJ84ewzxw7wVqdMqA99dj+O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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