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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999bd3c41cf8dd3e07c3c98e5b0e4157688aafd48f21b711866033e9b53baa51' 
  AND token = 'jZmWexCaCijIsosUQYD1BgM/MlaYCCg7cfaDN04rxtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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