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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a93815ea26f095fe2fafb718e496a80c7be2ae7700415dc76f60a80ada08d3e' 
  AND token = 'vxTNSTujyPj120quInVAU8d1ziBhttGxm7nyXgOSq6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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