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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ea9426b978df7a68bf8e7c11b8c6e577b2f237854b71f64fa95138326b515f' 
  AND token = 'FlffdcyqWuTsyk41N5z3OM+IRN8P+3Snvbspy7THPyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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