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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e006e1146d696a183ab76b2e370632451f7a0c5242d4c88f2100af83b0b808' 
  AND token = 'BHVKvlDebxxnBL/q0MZ7dPPV44SdcU1RZk/thwtd6KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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