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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f170c9efbbda0d98aa143504fd02a1529d2c7dd79005b96ce055add75aaaea86' 
  AND token = '9bOz6PdFwcrhfKH2t/3qDCuL6vWVch4wKW1JtX2Sj74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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