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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c3a6d0c4da1f84b847b80ca3b9b78237ee2e3dba04ba4dc21018f441f50574' 
  AND token = 'ZnwZdIKmiVMsj6ZElxtaxR5Q/WBv4U1XcsWNZ1ItknM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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