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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd37ec65f90d6f3b589cbf99c6af103aa245bc30cc675765b12dca8dcec449b' 
  AND token = 'l5c6Wk7eYuSpeu62VQng8oQ5oZKlfakiyfpA//AQf3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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