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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd94de5df0a7d789f38346b5111463ef8fdadad1a620e6a90fd003e2e205d83' 
  AND token = 'oIQsN5u7JHVXv/nufhu1Rez6oqIhuJs3GpWdKq+GuB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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