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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2030ce91544f2a95a5795ce4e7f79cd54c6bee256a72fafb3bfaedf0bfa1bef9' 
  AND token = 'Zm5VhHy9U+Bg+6ZPHrimzAGWq3tICgQBD1slrA+yVG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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