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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab57f16c480ec6379eed11806ec5f9de6f9d3b4e2de2f35d38c6056b41029072' 
  AND token = '892U7AbDvMHMmfOFJVLw1ljrk6st0ZQwLRjtoAz3WvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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