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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de64f40edbbe5b6c9fe2fca5a3debf4b6332b39d87d8ad96649ff60ef0a7e23b' 
  AND token = 'Na+Ks0c/3miD588smsnBohRmN4vkmoarSWKsgb4U1aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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