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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34057fbb17311cd9bf123e222d9953212e10191db471321d262062f7666d33d' 
  AND token = 'l93uD9ZmpY+neEPcNR2hZS5x0WhPQDJ3e3A4r5xyWew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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