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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b30cd919fb2b01527609667c6fc3ea9e876b5b89c305ac7a9c4bb88f30e9c0' 
  AND token = 'tRkc2T91C78y4TRyXOn6rtO7HyYuCnhUw3VT7dTvAVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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