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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e96462ab6a3b7067a8c3942600a415acbd89221d6723ce5adaaa1ce9e6dac0e' 
  AND token = 'aZvxTmrtbZ0st01U+zsV+WFYADn5jvNflkz1ZFaVPQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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