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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a04a9b758d2a8f77645e904c490d03e658c5c74dac0bf07f995e0d5875f2bae' 
  AND token = 'DzGVg5/Dz2gZJ9o1lbl9uf8rfhxmomMEezuI++w5fhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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