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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e62bf6610cdf73bc451c08df3cb64a26140dd1a73b8b4f1f3e02add078ed97' 
  AND token = 'nhX916jkHCFnVEhm26fa6UxMBtl+aALxemxxd+fDgAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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