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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0cfe390cb268d42c36ec095c7159b7a968b00231876182e6aa0860cb76fa4d' 
  AND token = 'f4u7W+5qqTsPL+zZFp4C7bXuX18wWfHMoy5a4OprMcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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