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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd54542fe7bc33ee5213517325d0d6d0c546e6d4fea0796f4da63b1467d3213f' 
  AND token = '5jiOMahd6cGMFjBpsCkpCxuH4mCU2fEMLoM/80KBjkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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