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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32d520c2027fc83b32fc5b02ad56ee835454cece31997919969a5765ca82790' 
  AND token = 'bkCA0w7dSGM1p3cWzvcwB5XKDMx+pbV2kMSIG+cEp7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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