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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17d1d3c2bbeb87d4bac23ef168956bb2286fe37dba7aafc47d6967598f584bf' 
  AND token = '4CHbHEM7kFFHaPGZfGK9Y7dU6AI3eT0o8o332J+T9Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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