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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc632b132d7c1c3283331c787c7e366d6b38eaa908fd81e804e14e3336e0090' 
  AND token = '9UzNjfNWH8RIKd42B0cWW+pTqdcuglKdVCxBS5CDsHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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