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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3a7968482297164a169d901ceb9c9cfa20cd95094dbe6040d732195a4410d4' 
  AND token = 'cxh4GuQUrJyGi59KdMjZc6fcmLVkExF7X9Y4atK7FiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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