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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98099b0c7a09244de8147e190ea41fa40e43fd33c6c1b84c463f3d35afa34e19' 
  AND token = '3rW9Q0lGX7MzNt+DSrfsG4KHIVkA1RTEGzo+gFdNnrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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