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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c724006597abd8cefc9679aec9999aec6ddd8557304530c9e0a34d98eb199d1' 
  AND token = '3T9v64DmrTkF8DihEm3GCVkhsQd8qHurRK2Ol0d9nd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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