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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae637260525dbbc8979279d33695f47134a58d4b198204e3e183b8fe0a1b63f8' 
  AND token = 'ootEiQQY0pXf0YUapZFDBokBPhK/hEbY2Ia+rHKQmRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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