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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012586cde310337d1a3c1a27acba0185c37f46edcc8a4c4cae77897ba2b5fb6e' 
  AND token = '5iaUuaFZ79dzmTPGhW3rLAHR5kvD4ew4UFO62/idnTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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