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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0ed5b70f6f42e6d52fcb803659bfa6b30ee01dbf42f97a74c335552d3f6b3f' 
  AND token = 'yGCQ+Asu5wU+a6hUP1y+P1wZLZ+LVPgEOAj+V4FmonE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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