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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b834be33e3e149092d92b835f41e6ee5eb3f556e7c33a5e8daa1c5b493343b4c' 
  AND token = '1MVGRRvpSnMBlA+zwE9970Js2edVHIdZWXbw3kNP7YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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