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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700c83169ce71f73a9be5beb95d42d048e3ea1303e813d49cf8450c0b457088f' 
  AND token = 'Ec22wJtepRDbTXPnBTVJd2iyBX7nd17I7hUeoQlXkqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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