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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87149f019562ceb58eb9418ca7c92245922954b2f41234e3c934085f11c9096' 
  AND token = 'KWx/bSheQ9wpa0CFLjH74dw1zJHzuKqK7QK3238WEbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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