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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400b3fc3d783674f3139231f2d257c847e8ca243846d8b60473a33f4e29831d7' 
  AND token = 'XLJZP3dQwaFC4vGiJqP8LYSiJimtKJubyF8o5BJQuQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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