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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbbd3e79deb59bb4e4dc5a34a2c4201a6131b12838938bde050b54b9fabe95c' 
  AND token = 'MTbI3muCTzaLDgfRiPIUN32roijjHQJaEUka53E0130=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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